Various cleanups

Changed gradle-all.sh so that Gradle JVM settings are picked up from grade.properties
Added Gradle plugin that verifies that SPRING_DATA_MONGODB_URI is set before running any tests that need MongoDB

java-spring/buildSrc/src/main/groovy/VerifyMongoDBConfigurationPlugin.groovy

@@ -0,0 +1,15 @@
+import org.gradle.api.*
+
+
+class VerifyMongoDBConfigurationPlugin implements Plugin<Project> {
+    void apply(Project project) {
+       project.test {
+            beforeSuite { x ->
+                if (x.parent == null) {
+                    if (System.getenv("SPRING_DATA_MONGODB_URI") == null)
+                        throw new RuntimeException("Please make sure that the environment variable SPRING_DATA_MONGODB_URI is set, e.g. export SPRING_DATA_MONGODB_URI=mongodb://192.168.59.103/mydb")
+                }
+            }
+        }
+    }
+}